UWB demodulating apparatus

Abstract

A demodulated signal is to be generated by use of a first detection signal detected a presence/absence of a signal according to a correlation between a reception signal PPM-modulated at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T+τ), a second detection signal detected a presence/absence of a signal according to a correlation between the reception signal and the reception signal delayed with a time (T), and a third detection signal detected a presence/absence of a signal according to a correlation between the reception signal and the reception signal delayed with a time (T−τ). By thus combining a plurality of delayed detections, it is possible to obtain a UWB demodulating apparatus configured with a circuit suited for integrated circuit fabrication.

1. A Ultra Wideband demodulating apparatus comprising:
 a first delayed-detecting section for outputting a first detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T+τ); 
 a second delayed-detecting section for outputting a second detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T); 
 a third delayed-detecting section for outputting a third detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T−τ); 
 a demodulating section for generating a demodulated signal by use of the first, second and third detection signals; and 
 a synchronism detecting section for detecting an error of delay time T from the first, second and third detection signals, generating a correcting signal representative of a direction to correct the delay time T, and outputting the correcting signal to the first, second and third delayed-detecting sections, wherein the first, second and third delayed-detecting sections correct the delay time T by use of the correcting signal thereby restoring a synchronism. 
 
   
   
     2. A Ultra Wideband demodulating apparatus comprising:
 a first delayed-detecting section for outputting a first detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T+τ); 
 a second delayed-detecting section for outputting a second detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T); 
 a third delayed-detecting section for outputting a third detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T−τ); and 
 a demodulating section for generating a demodulated signal by use of the first, second and third detection signals, 
 wherein the demodulating section comprises a latch section for recording a signal last arrived of the first and third detection signals, a positive-pulse generating section for generating a positive pulse signal when the first detection signal is detected and when the second detection signal is detected and the latch section has a record content of the first detection signal, a negative-pulse generating section for generating a negative pulse signal when the third detection signal is detected and when the second detection signal is detected and the latch section has a record content of the third detection signal, and a synthesizing section for adding the positive pulse signal and the negative pulse signal together. 
 
   
   
     3. A Ultra Wideband demodulating apparatus comprising:
 a first delayed-detecting section for outputting a first detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the recention signal delayed with a time (T+τ); 
 a second delayed-detecting section for outputting a second detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T); 
 a third delayed-detecting section for outputting a third detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T−τ); and 
 a demodulating section for generating a demodulated signal by use of the first, second and third detection signals, 
 wherein the demodulating section comprises a latch section for recording a signal last arrived of the first and third detection signals, a positive-pulse generating section for generating a positive pulse signal when the first detection signal is detected and when the second detection signal is detected and the latch section has a record content of the first detection signal, a negative-pulse generating section for generating a negative pulse signal when the third detection signal is detected and when the second detection signal is detected and the latch section has a record content of the third detection signal, and a synthesizing section for adding the positive pulse with a signal the negative pulse is delayed a time τ. 
 
   
   
     4. A Ultra Wideband demodulating apparatus comprising:
 a first mixing section for mixing a reception signal PPM (pulse position modulation) at a pulse interval T and a pulse variation width τ with the reception signal delayed with a time (T+τ), and generating a first mixed signal; 
 a first signal detecting section for generating a first detection signal when detecting a signal presence from an intensity of the first mixed signal; 
 a second mixing section for mixing the reception signal with the reception signal delayed with a time (T), and generating a second mixed signal; 
 a second signal detecting section for generating a second detection signal when detecting a signal presence from an intensity of the second mixed signal; 
 a third mixing section for mixing the reception signal with the reception signal delayed with a time (T−τ), and generating a third mixed signal; 
 a third signal detecting section for generating a third detection signal when detecting a signal presence from an intensity of the third mixed signal; and 
 a demodulating section for detecting a PPM-modulation state from generation timing of the first, second and third detection signals, 
 wherein the demodulating section comprises a latch section for recording a signal last arrived of the first and third detection signals, a positive-pulse generating section for generating a positive pulse signal when the first detection signal is detected and when the second detection signal is detected and the latch section has a record content of the first detection signal, a negative-pulse generating section for generating a negative pulse signal when the third detection signal is detected and when the second detection signal is detected and the latch section has a record content of the third detection signal, and a synthesizing section for adding the positive pulse signal and the negative pulse signal together. 
 
   
   
     5. A Ultra Wideband demodulating apparatus comprising:
 a first mixing section for mixing a reception signal PPM (pulse position modulation) at a pulse interval T and a pulse variation width τ with the reception signal delayed with a time (T+τ), and generating a first mixed signal; 
 a first signal detecting section for generating a first detection signal when detecting a signal presence from an intensity of the first mixed signal; 
 a second mixing section for mixing the reception signal with the reception signal delayed with a time (T), and generating a second mixed signal; 
 a second signal detecting section for generating a second detection signal when detecting a signal presence from an intensity of the second mixed signal; 
 a third mixing section for mixing the reception signal with the reception signal delayed with a time (T−τ), and generating a third mixed signal; 
 a third signal detecting section for generating a third detection signal when detecting a signal presence from an intensity of the third mixed signal; and 
 a demodulating section for detecting a PPM-modulation state from generation timing of the first, second and third detection signals, 
 wherein the demodulating section comprises a latch section for recording a signal last arrived of the first and third detection signals, a positive-pulse generating section for generating a positive pulse signal when the first detection signal is detected and when the second detection signal is detected and the latch section has a record content of the first detection signal, a negative-pulse generating section for generating a negative pulse signal when the third detection signal is detected and when the second detection signal Is detected and the latch section has a record content of the third detection signal, and a synthesizing section for adding the positive pulse with a signal the negative pulse is delayed a time τ. 
 
   
   
     6. A Ultra Wideband demodulating apparatus comprising:
 a first mixing section for mixing a reception signal PPM (pulse position modulation) at a pulse interval T and a pulse variation width τ with the reception signal delayed with a time (T+τ), and generating a first mixed signal; 
 a first signal detecting section for generating a first detection signal when detecting a signal presence from an intensity of the first mixed signal; 
 a second mixing section for mixing the reception signal with the reception signal delayed with a time (T), and generating a second mixed signal; 
 a second signal detecting section for generating a second detection signal when detecting a signal presence from an intensity of the second mixed signal; 
 a third mixing section for mixing the reception signal with the reception signal delayed with a time (T−τ), and generating a third mixed signal; 
 a third signal detecting section for generating a third detection signal when detecting a signal presence from an intensity of the third mixed signal; 
 a demodulating section for detecting a PPM-modulation state from generation timing of the first, second and third detection signals, 
 wherein the reception signal is a signal bi-phase-modulated in addition to PPM modulation, further comprising a first sign-detecting section for detecting a sign of the first detection signal and generating a first sign signal, a second sign-detecting section for detecting a sign of the second detection signal and generating a second sign signal, a third sign-detecting section for detecting a sign of the third detection signal and generating a third sign signal, and a second demodulating section for demodulating bi-phase modulation by use of the first, second and third sign signals, 
 wherein the second demodulating section comprises a signal detecting section for detecting a presence/absence of a signal by use of a signal intensity of the first to third sign signals, a positive-pulse generating section for generating a second positive pulse signal when a signal is detected in the signal detecting section, a negative-pulse generating section for detecting only a negative pulse in the first to third sign signal and generating a negative-pulse detection signal, an inverted-pulse generating section for holding a positive-or-negative binary sign and outputting an inverted pulse signal having an sign inverted from a sign being held when there is a negative pulse detecting signal, and a fourth mixing section for mixing the second positive pulse signal and the inverted pulse signal and obtaining a second demodulated signal. 
 
   
   
     7. A Ultra Wideband demodulating apparatus comprising:
 a first mixing section for mixing a reception signal PPM (pulse position modulation) at a pulse interval T and a pulse variation width τ with the reception signal delayed with a time (T+τ), and generating a first mixed signal; 
 a first signal detecting section for generating a first detection signal when detecting a signal presence from an intensity of the first mixed signal; 
 a second mixing section for mixing the reception signal with the reception signal delayed with a time (T), and generating a second mixed signal; 
 a second signal detecting section for generating a second detection signal when detecting a signal presence from an intensity of the second mixed signal; 
 a third mixing section for mixing the reception signal with the reception signal delayed with a time (T−τ), and generating a third mixed signal; 
 a third signal detecting section for generating a third detection signal when detecting a signal presence from an intensity of the third mixed signal; and 
 a demodulating section for detecting a PPM-modulation state from generation timing of the first, second and third detection signals, 
 further comprising a synchronism detecting section for detecting an error of delay time T by use of the first, second and third detection signals and generating a correcting signal representative of a direction toward making a correction to the delay time T, thereby correcting the delay time T by use of the correcting signal when delaying the reception signal. 
 
   
   
     8. A UWB demodulating apparatus according to  claim 7 , wherein, provided that the first detection signal is A, the second detection signal is B and the third detection signal is C, then the synchronism detecting section generates a correcting signal for increasing the delay time T in the case A is singly detected after detecting a combination of A and B as well as a combination of B and C, and for decreasing the delay time T in the case C is singly detected after detecting a combination of A and B as well as a combination of B and C. 
   
   
     9. A Ultra Wideband demodulating apparatus comprising:
 a first delayed-detecting section for outputting a first detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T+τ); 
 a second delayed-detecting section for outputting a second detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T−τ); and 
 a demodulating section for generating a demodulated signal by use of the first and second detection signals, 
 wherein the demodulating section outputs, as a demodulation result, a signal that is positive when one of the first and second detection signals is detected and negative when the other is detected. 
 
   
   
     10. A Ultra Wideband demodulating apparatus comprising:
 a first delayed-detecting section for outputting a first detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T+τ); 
 a second delayed-detecting section for outputting a second detection signal, according to a correlation between the reception signal and the reception signal delayed with a time (T−τ); and 
 a demodulating section for generating a demodulated signal by use of the first and second detection signals, 
 wherein the demodulating section is configured by an SR-type flip-flop having a set input for the one of the first and second detection signals and a reset input for the other, to output data output thereof as a demodulation result. 
 
   
   
     11. A Ultra Wideband demodulating apparatus comprising:
 a delayed-detection section for outputting a detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T); and 
 a demodulating section for generating a demodulated signal by use of the detection signal, 
 wherein the demodulating section holds an output state for a time T when the detection signal is inputted, and inverts an output signal at an interval of time T when the detection signal is not detected. 
 
   
   
     12. A Ultra Wideband demodulating apparatus comprising:
 a delayed-detection section for outputting a detection signal, according to a correlation between a reception signal PPM (pulse position modulation) at a pulse interval of T and a pulse variation width of τ and the reception signal delayed with a time (T); and 
 a demodulating section for generating a demodulated signal by use of the detection signal, 
 wherein the demodulating section comprises a clock section having a reset input with the detection signal and outputting a clock signal at an interval of time T, an edge detecting section for detecting a sign change of the clock signal and outputting an edge detection signal, an exclusive OR section for outputting a sign-change signal according to an exclusive OR of the edge detection signal and the clock signal, and a D-type flip-flop having a clock input with the sign-change signal, a data input with a data inverted output to thereby output a data output as a demodulated signal.